IOS键盘响应及处理

一个简单的登录功能，遇到最大的问题就是怎么处理弹出的键盘，如何让它下去，这是一个首先要处理的问题。

ViewController.h:

#import <UIKit/UIKit.h>

@interface DXWViewController : UIViewController

- (IBAction)OKClick:(id)sender;
- (IBAction)cancleClick:(id)sender;
@property (retain, nonatomic) IBOutlet UILabel *label;
- (IBAction)end:(id)sender;//键盘退出方法
@property (retain, nonatomic) IBOutlet UITextField *name;
@property (retain, nonatomic) IBOutlet UITextField *password;

@end

ViewController.m:

#import "DXWViewController.h"

@interface DXWViewController ()

@end

@implementation DXWViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    //view一加载就让输入框成为第一响应者
    [self.name becomeFirstResponder];
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
}

- (IBAction)OKClick:(id)sender {
    NSString *strName = self.name.text;
    NSString *strPwd = self.password.text;
    self.label.text = [NSString stringWithFormat:@"姓名：%@，密码：%@",strName,strPwd];
    //根据字的长度来设置label的大小，而不是用autolayerout来实现
    CGSize size = [self.label.text sizeWithFont:self.label.font];
    CGRect frame = CGRectMake(self.label.frame.origin.x,self.label.frame.origin.y, size.width, self.label.frame.size.height);
    self.label.frame = frame;
}

- (IBAction)cancleClick:(id)sender {
}
- (void)dealloc {
    [_label release];
    [_name release];
    [_password release];
    [super dealloc];
}
- (IBAction)end:(id)sender {
    [self.name resignFirstResponder];
    [self.password resignFirstResponder];
}
@end